#2
if the old channels come from a version >= 4.7 (last point of change in channellist format)...no problem..

testet here with a channellist from 4.82.1,4.79.x

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#5
Yes, ProgDVB 5.x not support old formats. I am not like have many old code in new generation. You can convert by last progdvb 4.8x version.